mozilla/pdf.js — pull request #1840 by yurydelendik (2012-06-24 04:38:25+00:00)
Title: Moves loading of the binary PDF data to the worker

This will avoid unnecessary serialization of the binary data between main and worker threads.

According, to the FF9 and below does not support typed array with XMLHttpRequest https://bugzilla.mozilla.org/show_bug.cgi?id=675504 . It's recommended to apply PR #1697